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求20.5*0.12的最简便算法

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14.4×0.5-0.12×5 =1.44×5-0.12×5 =(1.44-0.12)×5 =1.32×5 =6.6

求“0.8 x 0.25 x 0.4 x 12.5 =”的简便运算 运算思路:先按照相乘化整数的方法,0.8乘以12.5等于10,0.4乘以0.25等于0.1,再计算10乘以0.1等于1。 0.8 X 0.25 X 0.4 X 12.5 = ( 0.8 X 12.5 ) X ( 0.25 X 0.4) = 10 X 0.1 = 1

3.2*12.5*0.25 =4*0.8*12.5*0.25 =(4*0.25)*(0.8*12.5) =1*10 =10

0.8×0.25×0.4×12.5=0.25×0.4×0.8×12.5=0.1×10=1

简便计算20-12.5乘0.12 =20-12.5×4×0.03 =20-50×0.03 =20-1.5 =18.5

20-12.5×0.12 =20-12.5x4x0.03 =20-50x0.03 =20-1.5 =18.5 如果对您有帮助,望采纳!谢谢!

原式 0.8x0.25x0.4x12.5 =(0.8x12.5)x(0.25x0.4) =10x0.1 =1

1.25×8.8—12.5×0.88 =1.25×8.8—1.25x8.8 =0

=(12.5*0.8)*2.5*2*23 =10*(2.5*2)*23 =10*5*23 =1150

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